No Improvement in Endurance Performance after a Single Dose of Beetroot Juice

Ingestion of 140 ml of concentrated beetroot juice containing 8.7 mmol NO3- does not improve 1-hour time-trial performance in well-trained cyclists.

• Plasma nitrite concentration was significantly higher after beetroot juice ingestion compared to placebo before the time trial.
• No significant differences were observed in time-trial performance, power output, or heart rate between the beetroot juice and placebo groups.
• The study involved 20 trained male cyclists with an average age of 26 years and a maximum oxygen uptake of 60 ml · kg(-1) · min(-1).
• A double-blind, repeated-measures crossover design was used, ensuring reliability in treatment comparisons.

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